化简|x+y|-|y-x|+|y|,且y

化简|x+y|-|y-x|+|y|,且y x^/y-x-y^/y-x化简. 化简x(y-x)-y(x-y) 化简x/y(x+y)-y/x(x+y) 化简 x / y(x+y) - y / x(x+y) = 化简:(x+ y)(x-y) +(x+ y) +(x-y) 化简y(x+y)+(x+y)(x-y)-x^2 x,y都是正整数,且x+y {(x,y) |x|+|y| x>y?x:y 化简：[(x+y)(x-y)(x+y)^2-2y(x-2y)](-2y) 谢谢! 若x、y是实数,且y 已知x,y是实数,且y 若x,y是实数,且y 若x、y为实数,且y 若x,y都是实数,且y 已知x,y是实数,且y 若x,y为实数,且y